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保龄球按局数计分。
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每局有10格。
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每格由机器先置10只瓶。
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第1至第9格，每格最多可掷两球。第10格最多可掷3球。
- 每格中可能出现三种情形：
全倒：第一球将全部10只瓶击倒，称为“全倒”，用符号X表示。计分为10+后两球击倒球瓶数。
全倒之后，机器重置10瓶， 计入下一格。
补中：第一球没将球瓶全部击倒，而第二球将全部剩余球瓶击倒，称为“补中”，用符号/表示。计分为10+后一球击倒球瓶数。
失误（留瓶格）：第二球后仍有球瓶未倒，被称为“留瓶格”。计分为该格内两球击倒球瓶数相加。
上述三种情况任一发生之后，机器都会重置10只瓶，进入下一格。
- 第10格：当出现全倒时，机器会再置两次瓶,使可以投掷两球后结束该局。此后两球本身不计分。当出现补中时，机器再置一次瓶，使可在投掷一球结束该局，此球本身不计分。如果没有出现全倒或补中，则在第二球后结束该局。
- 电脑计分器通常不显示单格得分，而是累积分数。
- 每格最高分30分，当连续12个全倒10格中每格均为30分，累计300分，即为单局最高可能分数。（最后两球本身不记分）。
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l Bowling is played by Game.
l Each consists of ten frames
l Each fame except for the tenth consists of one of two balls. Only the tenth may consists of three balls.
l In each frame, one of three situations below will happen:
Strike. Which means that all 10 pins being knocked down by the first ball. Score symble is X. It scores as 10+ number of pins knocked down by the next two balls.
Machine will set another rack of 10 pins and the game goes to the next frame.
Spare. If the first ball does not knock down all 10 pins, either 1 or 10 left, second ball can be rolled. If all left pins being knocked down by the second ball, it is called Spare. Score symble is /. It scores as 10+number of pins knocked down by the next ball.
Open Frame (Miss). When non of the above two situation (Strike of Spare) happens, which means some pins left standing after the second ball. This is called Open Frame, or Miss.
Its score is the sum of the pins knocked down by the two balls in the frame.
Regardless there are pins left standing or not after the second ball, the machine will sweep and goes to the next frame.
The 10th Frame. When it comes to the 10th frame, if the first ball knocks down all pins, i.e., it is a STRIKE, two more ball will be rolled then the game ends. The last two balls themselves do not score. If it is a spare, then one more ball will be rolled before the game ends. The last ball itself does not score.
The computer score boards usually do not show the score for individul frame but the accumulated score total of the game.
The maximum scor for a frame is 30. A perfect game scores 300. 12 strikes in a roll makes each of the 10 frame score 30, a total of 300. The highest possible for a single game. (the last two strikes themselves do not score).
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